/**
*      author: Y_Yao
*      created: 2025-02-19 22:37:42
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
string s;
vector<char> st;

void solve()
{
    cin >> s;
    for(int i = 0;i < s.size();i++)
    {
        st.push_back(s[i]);
        int n = st.size();
        if(n >= 3 && st[n-1] == 'C' && st[n-2] == 'B' && st[n-3] == 'A')
        {
            int cnt = 3;
            while(cnt--)
            {
                st.pop_back();
            }
        }
    }
    for(auto& e : st)
    {
        cout << e;
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}